1999 - 2003 7.3L Power Stroke Diesel

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HELP IDM codes p01668 comms error

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Sep 23, 2016 | 12:57 PM

#1

blrman1962

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From: CT

HELP IDM codes p01668 comms error

truck wont start idm communication error all the fuses are good and the relay seams good I switched it out with another relay 340,000 miles how do I know if its the IDM r not please help I'm sure the idm is not cheap pleae advise help

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Old

Sep 23, 2016 | 12:57 PM

#2

blrman1962

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From: CT

help me please

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Old

Sep 23, 2016 | 02:28 PM

#3

pirschwagon

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Joined: May 2016

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Here is the troubleshooting process for P1668 (attached). In the absence of a Breakout Box a DVM and/or a DSO (digital storage oscilloscope) will surfice.

Attached Images

P1668.pdf (42.1 KB, 554 views)

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